public void DisplayNextSentence()
    {
        if (sentences.Count == 0)
        {
            EndDialogue();
            return;
        }
        string sentence = sentences.Dequeue();

        Audio_manager.StopPlaying(index - 1);

        StopAllCoroutines();
        Audio_manager.Play(index);
        index = index + 1;
        StartCoroutine(TypeSentence(sentence));
        //dialogueText.text = sentence;
    }